April 2011: The dashing couple matched in navy blue suits while visiting an athletic track in Darwen, England.

Photo: Indigo/Getty Images

April 2011

April 2011: Here comes the almost-bride... Kate smiled for the camera as she arrived at the Goring Hotel with her mom and sister the day before her wedding. She looked stunning in a patterned Issa dress and L.K. Bennett wedges.

Photo: George Pimentel/WireImage

April 2011

April 2011: The blushing bride steps out of Westminster Abbey, stunning in her Sarah Burton for Alexander McQueen gown.

Photo: CARL DE SOUZA/AFP/Getty Images

April 2011

April 2011: The new Duke and Duchess of Cambridge kiss on the balcony of Buckingham Palace to cheers from the crowd.

Photo: George Pimentel/WireImage

April 2011

April 2011: Kate leaving Clarence House to attend the evening celebrations following her wedding to Prince William, in a pretty satin dress with an embellished belt showing off her tiny waist.

Photo: JOHN STILLWELL/AFP/Getty Images

April 2011

April 2011: Kate and William headed out for their honeymoon the day after their wedding, Kate dressed in a simple belted blue dress and her L.K. Bennett wedges.

Kate prepared to dance with traditional dancers, in a much cooler grass skirt than we've ever seen.

(Photo via WireImage/Getty)

September 2012

Kate wore this navy eyelet Mulberry dress with traditional adornments during their visit, with her hair in natural waves.

(Photo via WireImage/Getty)

October 2012

Back in the UK, Kate and Wills attend the official launch of the new Football Centre, the Duchess wearing a Reiss coat.

(Photo via Getty)

October 2012

Kate bends down to receive flowers from an adorable two-year-old, looking lovely in Alexander McQueen.

(Photo via Getty)

October 2012

Kate attended a royal reception for team Great Britain's Olympic and Paralympic athletes, wearing a black floral dress with sheer sleeves.

(Photo via Getty)

November 2012

Kate dons her lace Temperley London gown once more, this time adding a pop of red with her Alexander McQueen clutch.

(Photo via Getty)

November 2012

Kate was glowing in an emerald green Mulberry dress for an opening at the Natural History Museum.

(Photo via Getty)

November 2012

Kate wore this MaxMara Studio coat over a leopard-print dress for her and William's first visit to Cambridge.

(Photo via UK Press/Getty)

November 2012

Kate played hockey in Alexander McQueen while visiting St. Andrews University.

(Photo via Getty)

December 2012

Kate left the hospital, after being admitted for severe morning sickness, in a navy coat by Diane von Furstenberg.

(Photo via Getty)

January 2013

Kate looks on in a pretty Whistles dress after viewing her first official portrait.

(Photo via AFP/Getty)

February 2013

Kate showed off her baby bump in a patterned MaxMara dress and simple pumps during a visit to Hope House.

(Photo via Getty)

March 2013

Kate visited Grimsby in a gorgeous brown Hobbs coat, with her baby bump just starting to show.

(Photo via WireImage/Getty)

March 2013

Kate attended the fourth and final day of the Cheltenham Festival in a gorgeous peach wool coat by Joseph.

(Photo via Getty)

March 2013

The Duchess of Cambridge attended the St Patrick's Day Parade at Mons Barracks in the same gorgeous green Emilia Wickstead coat of the previous year.

(Photo via Getty)

March 2013

Kate Middleton wore this black Topshop dress as she visited the headquarters of Child Bereavement UK.

(Photo via Getty)

March 2013

Dressed in a pretty white Redgrave Goat collarless coat over a dress from Topshop, Kate visited the headquarters of Child Bereavement UK.

(Photo via Getty)

March 2013

Kate visits the Baker Street Underground Station in this teal Malene Birger coat, and true to royal style: a pretty black fascinator.

(Photo via Getty)

March 2013

Kate visited the Great Tower Scout camp, keeping warm in green rain boots, a green army jacket and a knit crochet hat.

(Photo via Getty)

April 2013

During a visit to Scotland, Kate and Wills met well wishers, played some ping pong, field hockey and basketball while she wore this tartan coat by British brand moloh.

(Photo via Getty)

April 2013

Kate donned her red Armani coat, as seen on her in 2006, for the visit to Scotland.

(Photo via AFP/Getty)

April 2013

Kate attended the National Review of the Queen's Scouts, wearing a mint green Mulberry Coat, Whiteley fascinator and her L.K. Bennett pumps. As you can see, the Duchess finally popped and her baby bump was fully visible.

Catherine, Duchess of Cambridge attends day nine of the Wimbledon Tennis Championships at Wimbledon on July 8, 2015 in London, England.

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And while running 26.2 miles is a grueling feat even for the most impressive athlete, it'll probably be no sweat for Duchess Kate's husband! The 34-year-old royal is actually quite a sportsman after years of playing polo. He still plays the game, often appearing in charity matches with his little brother.

Duchess Kate, Prince William and Prince Harry joined forces in an inspirational speech to highlight their goal of normalizing the conversation surrounding mental health at the charity event in London.

"Mental health matters to each and every one of us. It matters just as much as our physical health," the Duke of Cambridge said.

His wife also agreed. "We have seen that two heads are better than one when dealing with a mental health problem," and added, "William, Harry and I have been very privileged to witness in the course of our work countless examples of simple conversations that have changed lives, which were the first step on a path to recovery."

Of course, Duchess Kate looked stunning as ever at the event, wearing a long-sleeved floral frock that hit just above her knees. She wore her hair down in a long and voluminous hairstyle.